| Date | Sun, 05 Feb 2012 23:11:08 +0100 | From | Willy Tarreau <> | Subject | [PATCH 79/91] SCSI: scsi_lib: fix potential NULL dereference |
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2.6.27-longterm review patch. If anyone has any objections, please let us know.
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commit 03b147083a2f9a2a3fbbd2505fa88ffa3c6ab194 upstream.
Stanse found a potential NULL dereference in scsi_kill_request.
Instead of triggering BUG() in 'if (unlikely(cmd == NULL))' branch, the kernel will Oops earlier on cmd dereference.
Move the dereferences after the if.
[ WT: starget is not set in 2.6.27 ]
Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- drivers/scsi/scsi_lib.c | 9 ++++++--- 1 files changed, 6 insertions(+), 3 deletions(-)
Index: longterm-2.6.27/drivers/scsi/scsi_lib.c =================================================================== --- longterm-2.6.27.orig/drivers/scsi/scsi_lib.c 2012-02-05 22:34:42.697916475 +0100 +++ longterm-2.6.27/drivers/scsi/scsi_lib.c 2012-02-05 22:34:46.142917247 +0100 @@ -1389,8 +1389,8 @@ static void scsi_kill_request(struct request *req, struct request_queue *q) { struct scsi_cmnd *cmd = req->special; - struct scsi_device *sdev = cmd->device; - struct Scsi_Host *shost = sdev->host; + struct scsi_device *sdev; + struct Scsi_Host *shost; blkdev_dequeue_request(req); @@ -1400,6 +1400,8 @@ BUG(); } + sdev = cmd->device; + shost = sdev->host; scsi_init_cmd_errh(cmd); cmd->result = DID_NO_CONNECT << 16; atomic_inc(&cmd->device->iorequest_cnt);
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